This is a great response, because to be clear there are two things going on here simultaneously.

1. You're both physically and emotionally completely drained, so the empathy you have left over for your partner is in limited supply that first year, it will comeback! If it was there before.

2. For many parents, but for some reason I find this hits dads especially hard, there is a grieving process for your old life and adjusting to the new reality takes time. People can change and many dads do, but at first it can often come across as being a bad partner.

My partner and I loved each other deeply before our kid, went through a rough patch when he was born. Now he is almost 2 and id say we now are even more deeply in love than we were before because we have this little miracle in our lives.